servlet 3 文件上传

1.up.jsp

<%@ page language="java" pageEncoding="utf-8"%>

<form action="upload.do" method="post" enctype="multipart/form-data">

content:<input type="text" name="content" value="中国人"><br>

file:<input type="file" name="file1"/><br>

file:<input type="file" name="file2"/><br>

file:<input type="file" name="file3"/><br>

<input type="submit" value="上传文件"/>

</form>

2.Upload.java

package com;



import java.io.IOException;

import javax.servlet.ServletException;

import javax.servlet.annotation.MultipartConfig;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.Part;



@MultipartConfig()

@WebServlet("/upload.do")

public class Upload extends HttpServlet {

    @Override

    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

        // 单文件

        // resp.setContentType("text/html;charset=utf-8");

        // Part part = req.getPart("file");

        // String c = req.getParameter("content");

        // c = new String(c.getBytes("iso8859-1"),"utf-8");

        // resp.getWriter().print(c);

        // String f = part.getHeader("content-disposition");

        // 获取文件名

        // String fn = f.substring(f.lastIndexOf("=")+2,f.length()-1);

        // System.out.println(part.getName());

        // System.out.println(part.getSize());//文件大小

        // System.out.println(part.getContentType());//文件类型

        // part.write(req.getServletContext().getRealPath("upload")+"/"+fn);

        // 多文件

        //for (Part p : req.getParts()) {

        //    if (p.getContentType()!=null) {

        //        String f = p.getHeader("content-disposition");

        //        String fn = f.substring(f.lastIndexOf("=") + 2, f.length() - 1);

        //        p.write(req.getServletContext().getRealPath("upload")+"/"+fn);

        //    }

        //}

    }

}